checkCIF procedure


PLAT791 Type_4 Check the absolute configuration of chiral atom in 'chiral' spgr
 This test addresses the consistency of the absolute configuration  
 assignment in non-centrosymmetric structures with proper symmetry  
 operations (i.e. all matrices with determinant = 1) only.  
 Verify the (R/S) absolute configuration assignment of this atom and
 the consistency of the absolute configuration implicit in the CIF-data 
 with that in the 'ORTEP' illustration. Torsion angles should have the  
 correct sign.  
 The absolute structure assignment should also be consistent with the   
 lowest value of the Flack parameter and/or know absolute configuration.
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